Well Cartman didn't help his own cause, broadcasting his phone calls as if he were a radio DJ. What NSA agent wouldn't be aware of this if he were around Cartman? Cartman worrying over the NSA spying on him without realizing his own part in making it possible.

I saw this really cool phone app that's gonna come out soon, that looks like it would protect against all of this NSA nonsense. http://www.flashtext.com